.buttons {
  position: absolute;
  bottom: 20px;
  left: 20px;

  padding: 0;
  margin: 0;
  list-style: none;
  z-index: 999;
}

.buttons>li {
  display: inline-block;
  margin-right: 10px;


}

.buttons>li>a {
  background: #ddd;
  border: solid 1px #666;
  display: inline-block;
  padding: 5px;
}

.buttons a {
  opacity: 0.3;
}

.buttons a.active {
  opacity: 1;
}